/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */

#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
#include <ngx_channel.h>

static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
	ngx_int_t type);
static void ngx_start_cache_manager_processes(ngx_cycle_t *cycle,
	ngx_uint_t respawn);
static void ngx_pass_open_channel(ngx_cycle_t *cycle, ngx_channel_t *ch);
static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo);
static ngx_uint_t ngx_reap_children(ngx_cycle_t *cycle);
static void ngx_master_process_exit(ngx_cycle_t *cycle);
static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data);
static void ngx_worker_process_init(ngx_cycle_t *cycle, ngx_uint_t priority);
static void ngx_worker_process_exit(ngx_cycle_t *cycle);
static void ngx_channel_handler(ngx_event_t *ev);
#if (NGX_THREADS)
static void ngx_wakeup_worker_threads(ngx_cycle_t *cycle);
static ngx_thread_value_t ngx_worker_thread_cycle(void *data);
#endif
static void ngx_cache_manager_process_cycle(ngx_cycle_t *cycle, void *data);
static void ngx_cache_manager_process_handler(ngx_event_t *ev);
static void ngx_cache_loader_process_handler(ngx_event_t *ev);

ngx_uint_t ngx_process;
ngx_pid_t ngx_pid;
ngx_uint_t ngx_threaded;

sig_atomic_t ngx_reap;
sig_atomic_t ngx_sigio;
sig_atomic_t ngx_sigalrm;
sig_atomic_t ngx_terminate;
sig_atomic_t ngx_quit;
sig_atomic_t ngx_debug_quit;
ngx_uint_t ngx_exiting;
sig_atomic_t ngx_reconfigure;
sig_atomic_t ngx_reopen;

sig_atomic_t ngx_change_binary;
ngx_pid_t ngx_new_binary;
ngx_uint_t ngx_inherited;
ngx_uint_t ngx_daemonized;

sig_atomic_t ngx_noaccept;
ngx_uint_t ngx_noaccepting;
ngx_uint_t ngx_restart;

#if (NGX_THREADS)
volatile ngx_thread_t ngx_threads[NGX_MAX_THREADS];
ngx_int_t ngx_threads_n;
#endif

uint64_t cpu_affinity;
static u_char master_process[] = "master process";

static ngx_cache_manager_ctx_t ngx_cache_manager_ctx =
{
	ngx_cache_manager_process_handler,
	"cache manager process",
	0
};

static ngx_cache_manager_ctx_t ngx_cache_loader_ctx =
{
	ngx_cache_loader_process_handler,
	"cache loader process",
	60000
};

static ngx_cycle_t ngx_exit_cycle;
static ngx_log_t ngx_exit_log;
static ngx_open_file_t ngx_exit_log_file;

void ngx_master_process_cycle(ngx_cycle_t *cycle)
{
	char *title;
	u_char *p;
	size_t size;
	ngx_int_t i;
	ngx_uint_t n, sigio;
	sigset_t set;
	struct itimerval itv;
	ngx_uint_t live;
	ngx_msec_t delay;
	ngx_listening_t *ls;
	ngx_core_conf_t *ccf;

	sigemptyset(&set);
	sigaddset(&set, SIGCHLD);
	sigaddset(&set, SIGALRM);
	sigaddset(&set, SIGIO);
	sigaddset(&set, SIGINT);
	sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
	sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
	sigaddset(&set, ngx_signal_value(NGX_NOACCEPT_SIGNAL));
	sigaddset(&set, ngx_signal_value(NGX_TERMINATE_SIGNAL));
	sigaddset(&set, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
	sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));

	if (sigprocmask(SIG_BLOCK, &set, NULL) == -1)
	{
		ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno, "sigprocmask() failed");
	}

	sigemptyset(&set);

	size = sizeof(master_process);

	for (i = 0; i < ngx_argc; i++)
	{
		size += ngx_strlen(ngx_argv[i]) + 1;
	}

	title = ngx_pnalloc(cycle->pool, size);

	p = ngx_cpymem(title, master_process, sizeof(master_process) - 1);
	for (i = 0; i < ngx_argc; i++)
	{
		*p++ = ' ';
		p = ngx_cpystrn(p, (u_char *) ngx_argv[i], size);
	}

	ngx_setproctitle(title);

	ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);

	ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_RESPAWN);
	ngx_start_cache_manager_processes(cycle, 0);

	ngx_new_binary = 0;
	delay = 0;
	sigio = 0;
	live = 1;

	for (;;)
	{
		if (delay)
		{
			if (ngx_sigalrm)
			{
				sigio = 0;
				delay *= 2;
				ngx_sigalrm = 0;
			}

			ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "termination cycle: %d", delay);

			itv.it_interval.tv_sec = 0;
			itv.it_interval.tv_usec = 0;
			itv.it_value.tv_sec = delay / 1000;
			itv.it_value.tv_usec = (delay % 1000) * 1000;

			if (setitimer(ITIMER_REAL, &itv, NULL) == -1)
			{
				ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,	"setitimer() failed");
			}
		}

		ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "sigsuspend");

		sigsuspend(&set);

		ngx_time_update();

		ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "wake up, sigio %i", sigio);

		if (ngx_reap)
		{
			ngx_reap = 0;
			ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "reap children");

			live = ngx_reap_children(cycle);
		}

		if (!live && (ngx_terminate || ngx_quit))
		{
			ngx_master_process_exit(cycle);
		}

		if (ngx_terminate)
		{
			if (delay == 0)
			{
				delay = 50;
			}

			if (sigio)
			{
				sigio--;
				continue;
			}

			sigio = ccf->worker_processes + 2 /* cache processes */;

			if (delay > 1000)
			{
				ngx_signal_worker_processes(cycle, SIGKILL);
			}
			else
			{
				ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_TERMINATE_SIGNAL));
			}

			continue;
		}

		if (ngx_quit)
		{
			ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));

			ls = cycle->listening.elts;
			for (n = 0; n < cycle->listening.nelts; n++)
			{
				if (ngx_close_socket(ls[n].fd) == -1)
				{
					ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_socket_errno, ngx_close_socket_n " %V failed", &ls[n].addr_text);
				}
			}
			cycle->listening.nelts = 0;

			continue;
		}

		if (ngx_reconfigure)
		{
			ngx_reconfigure = 0;

			if (ngx_new_binary)
			{
				ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_RESPAWN);
				ngx_start_cache_manager_processes(cycle, 0);
				ngx_noaccepting = 0;

				continue;
			}

			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");

			cycle = ngx_init_cycle(cycle);
			if (cycle == NULL)
			{
				cycle = (ngx_cycle_t *) ngx_cycle;
				continue;
			}

			ngx_cycle = cycle;
			ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,	ngx_core_module);
			ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_JUST_RESPAWN);
			ngx_start_cache_manager_processes(cycle, 1);

			/* allow new processes to start */
			ngx_msleep(100);

			live = 1;
			ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
		}

		if (ngx_restart)
		{
			ngx_restart = 0;
			ngx_start_worker_processes(cycle, ccf->worker_processes, NGX_PROCESS_RESPAWN);
			ngx_start_cache_manager_processes(cycle, 0);
			live = 1;
		}

		if (ngx_reopen)
		{
			ngx_reopen = 0;
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
			ngx_reopen_files(cycle, ccf->user);
			ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_REOPEN_SIGNAL));
		}

		if (ngx_change_binary)
		{
			ngx_change_binary = 0;
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "changing binary");
			ngx_new_binary = ngx_exec_new_binary(cycle, ngx_argv);
		}

		if (ngx_noaccept)
		{
			ngx_noaccept = 0;
			ngx_noaccepting = 1;
			ngx_signal_worker_processes(cycle, ngx_signal_value(NGX_SHUTDOWN_SIGNAL));
		}
	}
}

void ngx_single_process_cycle(ngx_cycle_t *cycle)
{
	ngx_uint_t i;

	if (ngx_set_environment(cycle, NULL) == NULL)
	{
		/* fatal */
		exit(2);
	}

	for (i = 0; ngx_modules[i]; i++)
	{
		if (ngx_modules[i]->init_process)
		{
			if (ngx_modules[i]->init_process(cycle) == NGX_ERROR)
			{
				/* fatal */
				exit(2);
			}
		}
	}

	for (;;)
	{
		ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");

		ngx_process_events_and_timers(cycle);

		if (ngx_terminate || ngx_quit)
		{

			for (i = 0; ngx_modules[i]; i++)
			{
				if (ngx_modules[i]->exit_process)
				{
					ngx_modules[i]->exit_process(cycle);
				}
			}

			ngx_master_process_exit(cycle);
		}

		if (ngx_reconfigure)
		{
			ngx_reconfigure = 0;
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reconfiguring");

			cycle = ngx_init_cycle(cycle);
			if (cycle == NULL)
			{
				cycle = (ngx_cycle_t *) ngx_cycle;
				continue;
			}

			ngx_cycle = cycle;
		}

		if (ngx_reopen)
		{
			ngx_reopen = 0;
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
			ngx_reopen_files(cycle, (ngx_uid_t) -1);
		}
	}
}

static void ngx_start_worker_processes(ngx_cycle_t *cycle, ngx_int_t n,
	ngx_int_t type)
{
	ngx_int_t i;
	ngx_channel_t ch;

	ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "start worker processes");

	ch.command = NGX_CMD_OPEN_CHANNEL;

	for (i = 0; i < n; i++)
	{

		cpu_affinity = ngx_get_cpu_affinity(i);

		ngx_spawn_process(cycle, ngx_worker_process_cycle, NULL,
			"worker process", type);

		ch.pid = ngx_processes[ngx_process_slot].pid;
		ch.slot = ngx_process_slot;
		ch.fd = ngx_processes[ngx_process_slot].channel[0];

		ngx_pass_open_channel(cycle, &ch);
	}
}

static void ngx_start_cache_manager_processes(ngx_cycle_t *cycle,
	ngx_uint_t respawn)
{
	ngx_uint_t i, manager, loader;
	ngx_path_t **path;
	ngx_channel_t ch;

	manager = 0;
	loader = 0;

	path = ngx_cycle->pathes.elts;
	for (i = 0; i < ngx_cycle->pathes.nelts; i++)
	{

		if (path[i]->manager)
		{
			manager = 1;
		}

		if (path[i]->loader)
		{
			loader = 1;
		}
	}

	if (manager == 0)
	{
		return;
	}

	ngx_spawn_process(cycle, ngx_cache_manager_process_cycle,
		&ngx_cache_manager_ctx, "cache manager process",
		respawn ? NGX_PROCESS_JUST_RESPAWN : NGX_PROCESS_RESPAWN);

	ch.command = NGX_CMD_OPEN_CHANNEL;
	ch.pid = ngx_processes[ngx_process_slot].pid;
	ch.slot = ngx_process_slot;
	ch.fd = ngx_processes[ngx_process_slot].channel[0];

	ngx_pass_open_channel(cycle, &ch);

	if (loader == 0)
	{
		return;
	}

	ngx_spawn_process(cycle, ngx_cache_manager_process_cycle,
		&ngx_cache_loader_ctx, "cache loader process",
		respawn ? NGX_PROCESS_JUST_SPAWN : NGX_PROCESS_NORESPAWN);

	ch.command = NGX_CMD_OPEN_CHANNEL;
	ch.pid = ngx_processes[ngx_process_slot].pid;
	ch.slot = ngx_process_slot;
	ch.fd = ngx_processes[ngx_process_slot].channel[0];

	ngx_pass_open_channel(cycle, &ch);
}

static void ngx_pass_open_channel(ngx_cycle_t *cycle, ngx_channel_t *ch)
{
	ngx_int_t i;

	for (i = 0; i < ngx_last_process; i++)
	{

		if (i == ngx_process_slot || ngx_processes[i].pid == -1
			|| ngx_processes[i].channel[0] == -1)
		{
			continue;
		}

		ngx_log_debug6(NGX_LOG_DEBUG_CORE, cycle->log, 0,
			"pass channel s:%d pid:%P fd:%d to s:%i pid:%P fd:%d",
			ch->slot, ch->pid, ch->fd,
			i, ngx_processes[i].pid,
			ngx_processes[i].channel[0]);

		/* TODO: NGX_AGAIN */

		ngx_write_channel(ngx_processes[i].channel[0], ch,
			sizeof(ngx_channel_t), cycle->log);
	}
}

static void ngx_signal_worker_processes(ngx_cycle_t *cycle, int signo)
{
	ngx_int_t i;
	ngx_err_t err;
	ngx_channel_t ch;

#if (NGX_BROKEN_SCM_RIGHTS)

	ch.command = 0;

#else

	switch (signo)
	{

	case ngx_signal_value(NGX_SHUTDOWN_SIGNAL):
		ch.command = NGX_CMD_QUIT;
		break;

	case ngx_signal_value(NGX_TERMINATE_SIGNAL):
		ch.command = NGX_CMD_TERMINATE;
		break;

	case ngx_signal_value(NGX_REOPEN_SIGNAL):
		ch.command = NGX_CMD_REOPEN;
		break;

	default:
		ch.command = 0;
	}

#endif

	ch.fd = -1;

	for (i = 0; i < ngx_last_process; i++)
	{

		ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
			"child: %d %P e:%d t:%d d:%d r:%d j:%d",
			i,
			ngx_processes[i].pid,
			ngx_processes[i].exiting,
			ngx_processes[i].exited,
			ngx_processes[i].detached,
			ngx_processes[i].respawn,
			ngx_processes[i].just_spawn);

		if (ngx_processes[i].detached || ngx_processes[i].pid == -1)
		{
			continue;
		}

		if (ngx_processes[i].just_spawn)
		{
			ngx_processes[i].just_spawn = 0;
			continue;
		}

		if (ngx_processes[i].exiting
			&& signo == ngx_signal_value(NGX_SHUTDOWN_SIGNAL))
		{
			continue;
		}

		if (ch.command)
		{
			if (ngx_write_channel(ngx_processes[i].channel[0], &ch,
				sizeof(ngx_channel_t), cycle->log) == NGX_OK)
			{
				if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL))
				{
					ngx_processes[i].exiting = 1;
				}

				continue;
			}
		}

		ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
			"kill (%P, %d)" , ngx_processes[i].pid, signo);

		if (kill(ngx_processes[i].pid, signo) == -1)
		{
			err = ngx_errno;
			ngx_log_error(NGX_LOG_ALERT, cycle->log, err, "kill(%P, %d) failed",
				ngx_processes[i].pid, signo);

			if (err == NGX_ESRCH)
			{
				ngx_processes[i].exited = 1;
				ngx_processes[i].exiting = 0;
				ngx_reap = 1;
			}

			continue;
		}

		if (signo != ngx_signal_value(NGX_REOPEN_SIGNAL))
		{
			ngx_processes[i].exiting = 1;
		}
	}
}

static ngx_uint_t ngx_reap_children(ngx_cycle_t *cycle)
{
	ngx_int_t i, n;
	ngx_uint_t live;
	ngx_channel_t ch;
	ngx_core_conf_t *ccf;

	ch.command = NGX_CMD_CLOSE_CHANNEL;
	ch.fd = -1;

	live = 0;
	for (i = 0; i < ngx_last_process; i++)
	{

		ngx_log_debug7(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
			"child: %d %P e:%d t:%d d:%d r:%d j:%d",
			i,
			ngx_processes[i].pid,
			ngx_processes[i].exiting,
			ngx_processes[i].exited,
			ngx_processes[i].detached,
			ngx_processes[i].respawn,
			ngx_processes[i].just_spawn);

		if (ngx_processes[i].pid == -1)
		{
			continue;
		}

		if (ngx_processes[i].exited)
		{

			if (!ngx_processes[i].detached)
			{
				ngx_close_channel(ngx_processes[i].channel, cycle->log);

				ngx_processes[i].channel[0] = -1;
				ngx_processes[i].channel[1] = -1;

				ch.pid = ngx_processes[i].pid;
				ch.slot = i;

				for (n = 0; n < ngx_last_process; n++)
				{
					if (ngx_processes[n].exited || ngx_processes[n].pid == -1
						|| ngx_processes[n].channel[0] == -1)
					{
						continue;
					}

					ngx_log_debug3(NGX_LOG_DEBUG_CORE, cycle->log, 0,
						"pass close channel s:%i pid:%P to:%P",
						ch.slot, ch.pid, ngx_processes[n].pid);

					/* TODO: NGX_AGAIN */

					ngx_write_channel(ngx_processes[n].channel[0], &ch,
						sizeof(ngx_channel_t), cycle->log);
				}
			}

			if (ngx_processes[i].respawn && !ngx_processes[i].exiting
				&& !ngx_terminate && !ngx_quit)
			{
				if (ngx_spawn_process(cycle, ngx_processes[i].proc,
					ngx_processes[i].data, ngx_processes[i].name,
					i) == NGX_INVALID_PID)
				{
					ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
						"could not respawn %s", ngx_processes[i].name);
					continue;
				}

				ch.command = NGX_CMD_OPEN_CHANNEL;
				ch.pid = ngx_processes[ngx_process_slot].pid;
				ch.slot = ngx_process_slot;
				ch.fd = ngx_processes[ngx_process_slot].channel[0];

				ngx_pass_open_channel(cycle, &ch);

				live = 1;

				continue;
			}

			if (ngx_processes[i].pid == ngx_new_binary)
			{

				ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx,
					ngx_core_module);

				if (ngx_rename_file((char *) ccf->oldpid.data,
					(char *) ccf->pid.data) != NGX_OK)
				{
					ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
						ngx_rename_file_n " %s back to %s failed "
						"after the new binary process \"%s\" exited",
						ccf->oldpid.data, ccf->pid.data, ngx_argv[0]);
				}

				ngx_new_binary = 0;
				if (ngx_noaccepting)
				{
					ngx_restart = 1;
					ngx_noaccepting = 0;
				}
			}

			if (i == ngx_last_process - 1)
			{
				ngx_last_process--;

			} else
			{
				ngx_processes[i].pid = -1;
			}

		} else if (ngx_processes[i].exiting || !ngx_processes[i].detached)
		{
			live = 1;
		}
	}

	return live;
}

static void ngx_master_process_exit(ngx_cycle_t *cycle)
{
	ngx_uint_t i;

	ngx_delete_pidfile(cycle);

	ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exit");

	for (i = 0; ngx_modules[i]; i++)
	{
		if (ngx_modules[i]->exit_master)
		{
			ngx_modules[i]->exit_master(cycle);
		}
	}

	ngx_close_listening_sockets(cycle);

	/*
	 * Copy ngx_cycle->log related data to the special static exit cycle,
	 * log, and log file structures enough to allow a signal handler to log.
	 * The handler may be called when standard ngx_cycle->log allocated from
	 * ngx_cycle->pool is already destroyed.
	 */

	ngx_exit_log_file.fd = ngx_cycle->log->file->fd;

	ngx_exit_log = *ngx_cycle->log;
	ngx_exit_log.file = &ngx_exit_log_file;

	ngx_exit_cycle.log = &ngx_exit_log;
	ngx_exit_cycle.files = ngx_cycle->files;
	ngx_exit_cycle.files_n = ngx_cycle->files_n;
	ngx_cycle = &ngx_exit_cycle;

	ngx_destroy_pool(cycle->pool);

	exit(0);
}

static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data)
{
	ngx_uint_t i;
	ngx_connection_t *c;

	ngx_process = NGX_PROCESS_WORKER;

	ngx_worker_process_init(cycle, 1);

	ngx_setproctitle("worker process");

#if (NGX_THREADS)
	{
		ngx_int_t n;
		ngx_err_t err;
		ngx_core_conf_t *ccf;

		ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);

		if (ngx_threads_n)
		{
			if (ngx_init_threads(ngx_threads_n, ccf->thread_stack_size, cycle)
				== NGX_ERROR)
			{
				/* fatal */
				exit(2);
			}

			err = ngx_thread_key_create(&ngx_core_tls_key);
			if (err != 0)
			{
				ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
					ngx_thread_key_create_n " failed");
				/* fatal */
				exit(2);
			}

			for (n = 0; n < ngx_threads_n; n++)
			{

				ngx_threads[n].cv = ngx_cond_init(cycle->log);

				if (ngx_threads[n].cv == NULL)
				{
					/* fatal */
					exit(2);
				}

				if (ngx_create_thread((ngx_tid_t *) &ngx_threads[n].tid,
						ngx_worker_thread_cycle,
						(void *) &ngx_threads[n], cycle->log)
					!= 0)
				{
					/* fatal */
					exit(2);
				}
			}
		}
	}
#endif

	for (;;)
	{

		if (ngx_exiting)
		{

			c = cycle->connections;

			for (i = 0; i < cycle->connection_n; i++)
			{

				/* THREAD: lock */

				if (c[i].fd != -1 && c[i].idle)
				{
					c[i].close = 1;
					c[i].read->handler(c[i].read);
				}
			}

			if (ngx_event_timer_rbtree.root == ngx_event_timer_rbtree.sentinel)
			{
				ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");

				ngx_worker_process_exit(cycle);
			}
		}

		ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0, "worker cycle");

		ngx_process_events_and_timers(cycle);

		if (ngx_terminate)
		{
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");

			ngx_worker_process_exit(cycle);
		}

		if (ngx_quit)
		{
			ngx_quit = 0;
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0,
				"gracefully shutting down");
			ngx_setproctitle("worker process is shutting down");

			if (!ngx_exiting)
			{
				ngx_close_listening_sockets(cycle);
				ngx_exiting = 1;
			}
		}

		if (ngx_reopen)
		{
			ngx_reopen = 0;
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
			ngx_reopen_files(cycle, -1);
		}
	}
}

static void ngx_worker_process_init(ngx_cycle_t *cycle, ngx_uint_t priority)
{
	sigset_t set;
	ngx_int_t n;
	ngx_uint_t i;
	struct rlimit rlmt;
	ngx_core_conf_t *ccf;
	ngx_listening_t *ls;

	if (ngx_set_environment(cycle, NULL) == NULL)
	{
		/* fatal */
		exit(2);
	}

	ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);

	if (priority && ccf->priority != 0)
	{
		if (setpriority(PRIO_PROCESS, 0, ccf->priority) == -1)
		{
			ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
				"setpriority(%d) failed", ccf->priority);
		}
	}

	if (ccf->rlimit_nofile != NGX_CONF_UNSET)
	{
		rlmt.rlim_cur = (rlim_t) ccf->rlimit_nofile;
		rlmt.rlim_max = (rlim_t) ccf->rlimit_nofile;

		if (setrlimit(RLIMIT_NOFILE, &rlmt) == -1)
		{
			ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
				"setrlimit(RLIMIT_NOFILE, %i) failed", ccf->rlimit_nofile);
		}
	}

	if (ccf->rlimit_core != NGX_CONF_UNSET)
	{
		rlmt.rlim_cur = (rlim_t) ccf->rlimit_core;
		rlmt.rlim_max = (rlim_t) ccf->rlimit_core;

		if (setrlimit(RLIMIT_CORE, &rlmt) == -1)
		{
			ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
				"setrlimit(RLIMIT_CORE, %O) failed", ccf->rlimit_core);
		}
	}

#ifdef RLIMIT_SIGPENDING
	if (ccf->rlimit_sigpending != NGX_CONF_UNSET)
	{
		rlmt.rlim_cur = (rlim_t) ccf->rlimit_sigpending;
		rlmt.rlim_max = (rlim_t) ccf->rlimit_sigpending;

		if (setrlimit(RLIMIT_SIGPENDING, &rlmt) == -1)
		{
			ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
				"setrlimit(RLIMIT_SIGPENDING, %i) failed",
				ccf->rlimit_sigpending);
		}
	}
#endif

	if (geteuid() == 0)
	{
		if (setgid(ccf->group) == -1)
		{
			ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
				"setgid(%d) failed", ccf->group);
			/* fatal */
			exit(2);
		}

		if (initgroups(ccf->username, ccf->group) == -1)
		{
			ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
				"initgroups(%s, %d) failed", ccf->username, ccf->group);
		}

		if (setuid(ccf->user) == -1)
		{
			ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
				"setuid(%d) failed", ccf->user);
			/* fatal */
			exit(2);
		}
	}

	if (cpu_affinity)
	{
		ngx_setaffinity(cpu_affinity, cycle->log);
	}

#if (NGX_HAVE_PR_SET_DUMPABLE)

	/* allow coredump after setuid() in Linux 2.4.x */

	if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1)
	{
		ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
			"prctl(PR_SET_DUMPABLE) failed");
	}

#endif

	if (ccf->working_directory.len)
	{
		if (chdir((char *) ccf->working_directory.data) == -1)
		{
			ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
				"chdir(\"%s\") failed", ccf->working_directory.data);
			/* fatal */
			exit(2);
		}
	}

	sigemptyset(&set);

	if (sigprocmask(SIG_SETMASK, &set, NULL) == -1)
	{
		ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
			"sigprocmask() failed");
	}

	/*
	 * disable deleting previous events for the listening sockets because
	 * in the worker processes there are no events at all at this point
	 */
	ls = cycle->listening.elts;
	for (i = 0; i < cycle->listening.nelts; i++)
	{
		ls[i].previous = NULL;
	}

	for (i = 0; ngx_modules[i]; i++)
	{
		if (ngx_modules[i]->init_process)
		{
			if (ngx_modules[i]->init_process(cycle) == NGX_ERROR)
			{
				/* fatal */
				exit(2);
			}
		}
	}

	for (n = 0; n < ngx_last_process; n++)
	{

		if (ngx_processes[n].pid == -1)
		{
			continue;
		}

		if (n == ngx_process_slot)
		{
			continue;
		}

		if (ngx_processes[n].channel[1] == -1)
		{
			continue;
		}

		if (close(ngx_processes[n].channel[1]) == -1)
		{
			ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
				"close() channel failed");
		}
	}

	if (close(ngx_processes[ngx_process_slot].channel[0]) == -1)
	{
		ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
			"close() channel failed");
	}

#if 0
	ngx_last_process = 0;
#endif

	if (ngx_add_channel_event(cycle, ngx_channel, NGX_READ_EVENT,
		ngx_channel_handler) == NGX_ERROR)
	{
		/* fatal */
		exit(2);
	}
}

static void ngx_worker_process_exit(ngx_cycle_t *cycle)
{
	ngx_uint_t i;
	ngx_connection_t *c;

#if (NGX_THREADS)
	ngx_terminate = 1;

	ngx_wakeup_worker_threads(cycle);
#endif

	for (i = 0; ngx_modules[i]; i++)
	{
		if (ngx_modules[i]->exit_process)
		{
			ngx_modules[i]->exit_process(cycle);
		}
	}

	if (ngx_exiting)
	{
		c = cycle->connections;
		for (i = 0; i < cycle->connection_n; i++)
		{
			if (c[i].fd != -1 && c[i].read && !c[i].read->accept
				&& !c[i].read->channel && !c[i].read->resolver)
			{
				ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
					"open socket #%d left in connection %ui", c[i].fd, i);
				ngx_debug_quit = 1;
			}
		}

		if (ngx_debug_quit)
		{
			ngx_log_error(NGX_LOG_ALERT, cycle->log, 0, "aborting");
			ngx_debug_point();
		}
	}

	/*
	 * Copy ngx_cycle->log related data to the special static exit cycle,
	 * log, and log file structures enough to allow a signal handler to log.
	 * The handler may be called when standard ngx_cycle->log allocated from
	 * ngx_cycle->pool is already destroyed.
	 */

	ngx_exit_log_file.fd = ngx_cycle->log->file->fd;

	ngx_exit_log = *ngx_cycle->log;
	ngx_exit_log.file = &ngx_exit_log_file;

	ngx_exit_cycle.log = &ngx_exit_log;
	ngx_exit_cycle.files = ngx_cycle->files;
	ngx_exit_cycle.files_n = ngx_cycle->files_n;
	ngx_cycle = &ngx_exit_cycle;

	ngx_destroy_pool(cycle->pool);

	ngx_log_error(NGX_LOG_NOTICE, ngx_cycle->log, 0, "exit");

	exit(0);
}

static void ngx_channel_handler(ngx_event_t *ev)
{
	ngx_int_t n;
	ngx_channel_t ch;
	ngx_connection_t *c;

	if (ev->timedout)
	{
		ev->timedout = 0;
		return;
	}

	c = ev->data;

	ngx_log_debug0(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel handler");

	for (;;)
	{

		n = ngx_read_channel(c->fd, &ch, sizeof(ngx_channel_t), ev->log);

		ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0, "channel: %i", n);

		if (n == NGX_ERROR)
		{

			if (ngx_event_flags & NGX_USE_EPOLL_EVENT)
			{
				ngx_del_conn(c, 0);
			}

			ngx_close_connection(c);
			return;
		}

		if (ngx_event_flags & NGX_USE_EVENTPORT_EVENT)
		{
			if (ngx_add_event(ev, NGX_READ_EVENT, 0) == NGX_ERROR)
			{
				return;
			}
		}

		if (n == NGX_AGAIN)
		{
			return;
		}

		ngx_log_debug1(NGX_LOG_DEBUG_CORE, ev->log, 0,
			"channel command: %d", ch.command);

		switch (ch.command)
		{

		case NGX_CMD_QUIT:
			ngx_quit = 1;
			break;

		case NGX_CMD_TERMINATE:
			ngx_terminate = 1;
			break;

		case NGX_CMD_REOPEN:
			ngx_reopen = 1;
			break;

		case NGX_CMD_OPEN_CHANNEL:

			ngx_log_debug3(NGX_LOG_DEBUG_CORE, ev->log, 0,
				"get channel s:%i pid:%P fd:%d",
				ch.slot, ch.pid, ch.fd);

			ngx_processes[ch.slot].pid = ch.pid;
			ngx_processes[ch.slot].channel[0] = ch.fd;
			break;

		case NGX_CMD_CLOSE_CHANNEL:

			ngx_log_debug4(NGX_LOG_DEBUG_CORE, ev->log, 0,
				"close channel s:%i pid:%P our:%P fd:%d",
				ch.slot, ch.pid, ngx_processes[ch.slot].pid,
				ngx_processes[ch.slot].channel[0]);

			if (close(ngx_processes[ch.slot].channel[0]) == -1)
			{
				ngx_log_error(NGX_LOG_ALERT, ev->log, ngx_errno,
					"close() channel failed");
			}

			ngx_processes[ch.slot].channel[0] = -1;
			break;
		}
	}
}

#if (NGX_THREADS)

static void
ngx_wakeup_worker_threads(ngx_cycle_t *cycle)
{
	ngx_int_t i;
	ngx_uint_t live;

	for (;; )
	{

		live = 0;

		for (i = 0; i < ngx_threads_n; i++)
		{
			if (ngx_threads[i].state < NGX_THREAD_EXIT)
			{
				if (ngx_cond_signal(ngx_threads[i].cv) == NGX_ERROR)
				{
					ngx_threads[i].state = NGX_THREAD_DONE;

				} else
				{
					live = 1;
				}
			}

			if (ngx_threads[i].state == NGX_THREAD_EXIT)
			{
				ngx_thread_join(ngx_threads[i].tid, NULL);
				ngx_threads[i].state = NGX_THREAD_DONE;
			}
		}

		if (live == 0)
		{
			ngx_log_debug0(NGX_LOG_DEBUG_CORE, cycle->log, 0,
				"all worker threads are joined");

			/* STUB */
			ngx_done_events(cycle);
			ngx_mutex_destroy(ngx_event_timer_mutex);
			ngx_mutex_destroy(ngx_posted_events_mutex);

			return;
		}

		ngx_sched_yield();
	}
}

static ngx_thread_value_t
ngx_worker_thread_cycle(void *data)
{
	ngx_thread_t *thr = data;

	sigset_t set;
	ngx_err_t err;
	ngx_core_tls_t *tls;
	ngx_cycle_t *cycle;

	cycle = (ngx_cycle_t *) ngx_cycle;

	sigemptyset(&set);
	sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
	sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
	sigaddset(&set, ngx_signal_value(NGX_CHANGEBIN_SIGNAL));

	err = ngx_thread_sigmask(SIG_BLOCK, &set, NULL);
	if (err)
	{
		ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
			ngx_thread_sigmask_n " failed");
		return (ngx_thread_value_t) 1;
	}

	ngx_log_debug1(NGX_LOG_DEBUG_CORE, cycle->log, 0,
		"thread " NGX_TID_T_FMT " started", ngx_thread_self());

	ngx_setthrtitle("worker thread");

	tls = ngx_calloc(sizeof(ngx_core_tls_t), cycle->log);
	if (tls == NULL)
	{
		return (ngx_thread_value_t) 1;
	}

	err = ngx_thread_set_tls(ngx_core_tls_key, tls);
	if (err != 0)
	{
		ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
			ngx_thread_set_tls_n " failed");
		return (ngx_thread_value_t) 1;
	}

	ngx_mutex_lock(ngx_posted_events_mutex);

	for (;; )
	{
		thr->state = NGX_THREAD_FREE;

		if (ngx_cond_wait(thr->cv, ngx_posted_events_mutex) == NGX_ERROR)
		{
			return (ngx_thread_value_t) 1;
		}

		if (ngx_terminate)
		{
			thr->state = NGX_THREAD_EXIT;

			ngx_mutex_unlock(ngx_posted_events_mutex);

			ngx_log_debug1(NGX_LOG_DEBUG_CORE, cycle->log, 0,
				"thread " NGX_TID_T_FMT " is done",
				ngx_thread_self());

			return (ngx_thread_value_t) 0;
		}

		thr->state = NGX_THREAD_BUSY;

		if (ngx_event_thread_process_posted(cycle) == NGX_ERROR)
		{
			return (ngx_thread_value_t) 1;
		}

		if (ngx_event_thread_process_posted(cycle) == NGX_ERROR)
		{
			return (ngx_thread_value_t) 1;
		}

		if (ngx_process_changes)
		{
			if (ngx_process_changes(cycle, 1) == NGX_ERROR)
			{
				return (ngx_thread_value_t) 1;
			}
		}
	}
}

#endif

static void ngx_cache_manager_process_cycle(ngx_cycle_t *cycle, void *data)
{
	ngx_cache_manager_ctx_t *ctx = data;

	void *ident[4];
	ngx_event_t ev;

	cycle->connection_n = 512;

	ngx_process = NGX_PROCESS_HELPER;

	ngx_worker_process_init(cycle, 0);

	ngx_close_listening_sockets(cycle);

	ngx_memzero(&ev, sizeof(ngx_event_t));
	ev.handler = ctx->handler;
	ev.data = ident;
	ev.log = cycle->log;
	ident[3] = (void *) -1;

	ngx_use_accept_mutex = 0;

	ngx_setproctitle(ctx->name);

	ngx_add_timer(&ev, ctx->delay);

	for (;;)
	{

		if (ngx_terminate || ngx_quit)
		{
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "exiting");
			exit(0);
		}

		if (ngx_reopen)
		{
			ngx_reopen = 0;
			ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "reopening logs");
			ngx_reopen_files(cycle, -1);
		}

		ngx_process_events_and_timers(cycle);
	}
}

static void ngx_cache_manager_process_handler(ngx_event_t *ev)
{
	time_t next, n;
	ngx_uint_t i;
	ngx_path_t **path;

	next = 60 * 60;

	path = ngx_cycle->pathes.elts;
	for (i = 0; i < ngx_cycle->pathes.nelts; i++)
	{

		if (path[i]->manager)
		{
			n = path[i]->manager(path[i]->data);

			next = (n <= next) ? n : next;

			ngx_time_update();
		}
	}

	if (next == 0)
	{
		next = 1;
	}

	ngx_add_timer(ev, next * 1000);
}

static void ngx_cache_loader_process_handler(ngx_event_t *ev)
{
	ngx_uint_t i;
	ngx_path_t **path;
	ngx_cycle_t *cycle;

	cycle = (ngx_cycle_t *) ngx_cycle;

	path = cycle->pathes.elts;
	for (i = 0; i < cycle->pathes.nelts; i++)
	{

		if (ngx_terminate || ngx_quit)
		{
			break;
		}

		if (path[i]->loader)
		{
			path[i]->loader(path[i]->data);
			ngx_time_update();
		}
	}

	exit(0);
}
